package ide.ccf.ccproject.wizards.pages;

import ide.ccf.ccproject.translate.Message;

import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.Path;
import org.eclipse.jface.dialogs.IDialogPage;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.wizard.WizardPage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.dialogs.ContainerSelectionDialog;


/**
 * 新建资源文件向导页面类
 * “新建”向导页面允许为新文件和新文件名设置容器。该页面将只接受无扩展名或者扩展名符合指定的规则（qrc）的文件名。
 *
 */
public class ResourceWizardPage extends WizardPage 
{
	private Text containerText;
	private Text fileText;
	private ISelection selection;

	/**
	 * 构造器
	 * @param selection
	 */
	public ResourceWizardPage(ISelection selection) 
	{
		super("wizardPage");
		setTitle(Message.ResourceWizardPage_0);
		setDescription(Message.ResourceWizardPage_1);
		this.selection = selection;
	}

	/**
	 * 创建页面显示控制
	 * @see IDialogPage#createControl(Composite)
	 */
	public void createControl(Composite parent) 
	{
		Composite container = new Composite(parent, SWT.NULL);
		GridLayout layout = new GridLayout();
		container.setLayout(layout);
		layout.numColumns = 3;
		layout.verticalSpacing = 9;
		Label label = new Label(container, SWT.NULL);
		label.setText(Message.ResourceWizardPage_2);

		containerText = new Text(container, SWT.BORDER | SWT.SINGLE);
		GridData gd = new GridData(GridData.FILL_HORIZONTAL);
		containerText.setLayoutData(gd);
		containerText.addModifyListener(new ModifyListener() 
		{
			public void modifyText(ModifyEvent e) 
			{
				dialogChanged();
			}
		});

		Button button = new Button(container, SWT.PUSH);
		button.setText(Message.CCFPreferencdPage_1);
		button.addSelectionListener(new SelectionAdapter() 
		{
			public void widgetSelected(SelectionEvent e) 
			{
				handleBrowse();
			}
		});
		label = new Label(container, SWT.NULL);
		label.setText(Message.ResourceWizardPage_3);

		fileText = new Text(container, SWT.BORDER | SWT.SINGLE);
		gd = new GridData(GridData.FILL_HORIZONTAL);
		fileText.setLayoutData(gd);
		fileText.addModifyListener(new ModifyListener() 
		{
			public void modifyText(ModifyEvent e) 
			{
				dialogChanged();
			}
		});
		
		initialize();
		dialogChanged();
		setControl(container);
	}

	/**
	 * 初始化
	 */
	private void initialize() 
	{
		if (selection != null && selection.isEmpty() == false && selection instanceof IStructuredSelection) 
		{
			IStructuredSelection ssel = (IStructuredSelection) selection;
			
			if (ssel.size() > 1)
				return;
			
			Object obj = ssel.getFirstElement();
			
			if (!(obj instanceof IResource) && (obj instanceof IAdaptable))
				obj = ((IAdaptable)obj).getAdapter(IResource.class);
			
			if (obj instanceof IResource) 
			{
				IContainer container;
				
				if (obj instanceof IContainer)
					container = (IContainer) obj;
				else
					container = ((IResource) obj).getParent();
				
				containerText.setText(container.getFullPath().makeRelative().toString());
			}
		}
		fileText.setFocus();
	}

	/**
	 * 浏览按钮事件处理 
	 * 使用标准容器选择对话框选择源文件夹字段值
	 */
	private void handleBrowse() 
	{
		ContainerSelectionDialog dialog = new ContainerSelectionDialog(getShell(), ResourcesPlugin.getWorkspace().getRoot(), false, "选择源文件夹");
		
		if (dialog.open() == ContainerSelectionDialog.OK) 
		{
			Object[] result = dialog.getResult();
			
			if (result.length == 1) 
			{
				containerText.setText(((Path) result[0]).makeRelative().toString());
			}
		}
	}

	/**
	 * 对话框变化事件处理
	 */
	private void dialogChanged() 
	{
		IResource container = ResourcesPlugin.getWorkspace().getRoot().findMember(new Path(getContainerName()));
		String fileName = getFileName();

		if (getContainerName().length() == 0) 
		{
			updateStatus(Message.ResourceWizardPage_4);
			return;
		}
		
		if (container == null || (container.getType() & (IResource.PROJECT | IResource.FOLDER)) == 0) 
		{
			updateStatus(Message.ResourceWizardPage_5);
			return;
		}
		
		if (!container.isAccessible()) 
		{
			updateStatus(Message.ResourceWizardPage_6);
			return;
		}
		
		if (fileName.length() == 0) 
		{
			updateStatus(Message.ResourceWizardPage_7);
			return;
		}
		
		if (fileName.replace('\\', '/').indexOf('/', 1) > 0) 
		{
			updateStatus(Message.ResourceWizardPage_8);
			return;
		}
		
		if (fileName.indexOf(' ') >= 0) 
		{
			updateStatus(Message.ResourceWizardPage_9);
			return;
		}
		
		int dotLoc = fileName.lastIndexOf('.');
		String ext = "";
		
		if (dotLoc != -1) 
		{
			ext = fileName.substring(dotLoc + 1);
		}
		
		if (ext.equalsIgnoreCase("qrc") == false) 
		{
			updateStatus(Message.ResourceWizardPage_10 + "\"qrc\"");
			return;
		}
		
		if (ResourcesPlugin.getWorkspace().getRoot().findMember(getContainerName() + "/" + fileName) != null) 
		{
			updateStatus(Message.ResourceWizardPage_11);
			return;
		}
		
		updateStatus(null);
	}

	/**
	 * 更新状态
	 * @param message
	 */
	private void updateStatus(String message) 
	{
		setErrorMessage(message);
		setPageComplete(message == null);
	}

	/**
	 * 获取容器名称
	 * @return
	 */
	public String getContainerName() 
	{
		return containerText.getText();
	}

	/**
	 * 获取文件名称
	 * @return
	 */
	public String getFileName() 
	{
		return fileText.getText();
	}
}